[Python-3000] how to deal with compatibility problems (example: turtle module)

[Gregor Lingl]

Guido van Rossum schrieb:
> The old turtle.py explicitly says
>
> from math import * # Also for export
>
> so I think it's desirable to keep this behavior. My intent with that
> line was that an absolute beginner could put "from turtle import *" in
> their interactive session and be able to use both the turtle code and
> the high-school math functions that might come in handy, like sin()
> and cos(). The other math functions don' really hurt I believe. Where
> there's a naming conflict, obviously the turtle module wins.
>
> --Guido
>   
Thanks for the quick reply, I'll do it this way.

Gregor

P.S.: I'd just like to add one (critical) remark which results from some
decades working as a highschool teacher and (nearly) one decade working
with Python, and especially turtle graphics with highschool students:

sin() and cos() imported from math work with radians. The default
angle-mode for turtle is degrees. So when using trig-functions I have
to talk about radian measure and conversion of angle units. To calculate
the sine of 30 degrees for instance I had to call sin(radians(30)) etc.,
but unfortunately just this radians() functions is not available anymore
when doing from turtle import *. So in this case this import is of limited
use. And it definitely makes sense to tell highschool students that
sin(), cos() and friends live in a module called math.